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问题 选择题

Last Sunday he promised ________ today, but he hasn't appeared yet.

A．that he would come

B．that he will come

C．he will come to see me

D．whether he would come

答案

答案：A

选择题
如图所示，在做共点力合成的实验中，某同学研究了这样一个办法：使弹簧秤Ⅱ从图示位置开始顺时针方向缓慢转动到水平位置，若保持F1的方向不变，且结点始终位于O点，那么，请帮助同学判断，在该过程中弹簧秤Ⅰ和Ⅱ的读数的变化情况（　　）

A．F1增大，F2减小

B．F1减小，F2增大

C．F1增大，F2先增大后减小

D．F1减小，F2先减小后增大
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单项选择题

() do you have PE lessons
—Three times a week.

A. How long

B. How soon

C. How many

D. How often
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